Die for forging insulator caps



- wsaws April 16, 1929.

c. w. STOVER 1,709,328 I DIE FOR FORGING INSULATOR CAPS Filed July 5, 1925 2 Sheets-Sheet l Wu WWI flllllllulllllllllllll'l! C. WSzozJer (like: u:

April 16, 1929. c w, s ov 1,709,328

DIE FOR FORGING INSULATOR CAPS Filed July 1923 2 Sheets-Sheet 2 a Bkl I 21' 4 26 Patented Apr. 16, 1929.

PATENT OFFICE.

CLINTON W. STOVER, OF CANTON, OHIO.

DIE FOR FORGING INSULATOR GAPS.

Application filed July 5, 1923. Serial No. 649,449.

The invention relates to metal insulator caps used for supporting high tension conductors, and the object of the improvement is to make the cap by a forging process as distinguished from a casting process.

Insulator caps are usually formed in the shape of an inverted cup, and are frequently provided with two apertured ears on the top for a supporting connection and wlth an internally recessed rim for engaging the cement which secures the head of an insulator within the cap.

The new method of making such an msulator cap involves the forging of a cup with two laterally spaced ear lugs on its 'bottom and an off-set flange on its rim; followed by the boring of apertures in the ears and the formation of a recessed rim from the flange by a bending or closing operat1on.

The several steps of the process are 11- lustrated in the accompanying drawlngs, forming part hereof, in which Figure 1 is a side elevation of an nsulator, showing its head and cap in section;

Fig. 2, a pers ective view of a cyllndric blank from whic a cap may be made;

Fig. 3, a side elevation of a punch and die showing the one entering the other;

Fig. 4, a section of the punch and die on line M, Fig. 7

Fig. 5, a detached perspective yiew of a tongue bar for the die on each side of the upper end of the channel;

Fig. 6, a sectional view of a cap forged with extruded ears and off-set mm;

Fig. 7, a plan view of the die;

Fig. 8, a sectional view of the same on 11ne 8-8, Fig. 7, showing a cap with extruded ears and off-set rim forged thereon;

Fig. 9, a fragmentary section of a punch and die for inwardly bending or closing the rim flange;

Fig. 10, a section of a cap having its rim flange bent inward; I I n Fig. 11, a section of a ram and die for flattening the inwardly bent flange; and

Fig. 12, a section of the completed cap.

Similar numerals refer to similar parts throughout the drawings. l The cap 13 for the head 14 of an insulator 15 is preferably provided with a pair of spaced and apertured cars 16 for a supportsame in a cupped shaped recess 20 in a die 21, wherein it is forged by means of a correspondingly shaped punch 22.

A channel or way 23 extends from the bottom of the cupped shaped recess 20 downward through the die to the bottom thereof;

which channel is shaped to neatly fit a flat-v tened tongue bar 24, the upper end of which bar forms the space between the ears 16 which are extruded by the forging operation from the blank on each side of the tongue into ear recesses 25 provided in the die for that purpose.

The cup shaped recess 20 in the die is rabbeted at the rim 26 to form an off-set 27 in the rim of the cap; and if the cap should adhere to or stick in the die it may be dislodged therefrom by striking upon the lower end of the tongue bar 24. The off-set rim 27 may then be bent or closed inward by means of a punch 28 and a die 29, the die being shaped to surround and sustain the body ortion 26 and the offset 27 of the rim of t e cap, and the punch having a conical rim 30 for shaping and deflecting inward the edge portion 31 of the cap rim, and also being provided with a protruding head 32, cylindrically shaped at its base 33 to sustain the edge of the rim and tapered toward its end to fit and truly shape and press the walls of the cup within the die.

If it be desired to flatten the inward defiected rim to a plane perpendicular to the axis of the cap, the same may be done by a ram 34 and a die 35, as shown in Fig. 11; thus completing the formation of the cap, as shown in Fig. 12. It will be understood, however, that the rim need not be thus flattened, in which event the forging and shaping process may terminate with the rim bending or closing operation illustrated in Fig. 9.

fter the cap has been forged, apertures 36 may be provided by cutting or boring the bottom of said recess to the bottom of holes through the ears, for receiving the the die and ear sha ed recesses on each side shanks of bolts usually employed for a supof the upper end 0 the channel, a movable 10 porting connection. tongue bar fitted in the channel and extend- I claim: ing upward between the ear shaped recesses A forging die having a cupped shaped rein the die. cess, a channel extending downward from CLINTON W. STOVER. 

